Free Online Ukulele Tuner
Pluck a string into your microphone and the tuner instantly identifies the closest standard string, the exact Hz, and whether you are sharp or flat — no app needed.
Click Start Tuner and pluck a string…
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How to Tune Your Ukulele
- Click Start Tuner and allow microphone access.
- Pluck one string at a time and let it ring clearly — avoid touching other strings.
- The highlighted card shows the closest standard string. The cents meter shows how sharp or flat you are.
- Turn the tuning peg slowly. Tune up to pitch from below — it stays in tune longer.
- When the meter centers on green (within ±5 cents), the string is in tune. Repeat for all 4 strings.
- After tuning all 4 strings, re-check the first string — tuning one string can slightly affect others.
Standard GCEA String Reference
| String | Note | Frequency | Description |
|---|---|---|---|
| 4 (G) | G4 | 392.00 Hz | Re-entrant high G string |
| 3 (C) | C4 | 261.63 Hz | Middle C — lowest pitched string |
| 2 (E) | E4 | 329.63 Hz | Between C and A strings |
| 1 (A) | A4 | 440.00 Hz | Concert A — highest string |
Standard ukulele tuning uses re-entrant G4 — the G string is higher pitched than the C string. This creates the bright, distinctive ukulele sound.
Alternate Ukulele Tunings
Select an alternate tuning in the widget above to match these reference pitches.
Tune in Order
Start with the C string (string 3), then G, E, and A. The C string is the easiest reference pitch for ukulele. Re-check all strings after the first pass.
New Strings Need Time
New nylon or fluorocarbon strings take 1–2 weeks to fully stretch and settle. Tune frequently during this break-in period and always tune up to pitch from below.
Temperature Matters
Ukuleles are sensitive to temperature and humidity. Always re-tune after bringing your ukulele in from outside or changing environments. Store in a case with a humidity control pack.
The Re-Entrant G
The G string (string 4) is tuned to G4 — higher than the C string. This is intentional. If the tuner shows your G string as G3, tune it up one octave to G4 for standard re-entrant tuning.
Tune Before Every Session
Ukuleles go out of tune between sessions due to temperature and humidity changes. Make tuning the first thing you do every time you pick up your ukulele — it takes less than a minute with this tuner.
Check Intonation at the 12th Fret
If open strings are in tune but fretted notes sound off, check intonation by playing the 12th fret harmonic and the 12th fret fretted note — they should match. Poor intonation may indicate a nut or saddle adjustment is needed.
Ukulele Sizes at a Glance
Bright, classic ukulele sound. Best for traditional Hawaiian style and beginners.
Slightly fuller sound, more fret space. Great all-around choice for most players.
Louder, warmer tone, wider neck. Preferred by fingerstyle and solo players.
Deepest ukulele sound, same tuning as guitar top 4 strings. Select the Baritone preset above.
Ukulele Tuner FAQ
Standard ukulele tuning (GCEA) from string 4 to string 1: G4 (392.00 Hz), C4 (261.63 Hz), E4 (329.63 Hz), A4 (440.00 Hz). Note that the G string is re-entrant — higher pitched than the C string.
Yes. Soprano, concert, and tenor ukuleles all use the same standard GCEA tuning. This tuner works for all three sizes. Baritone ukulele uses DGBE tuning — select the Baritone preset above.
Re-entrant tuning means the strings are not in ascending pitch order. On ukulele, the G string is tuned to G4 — higher than the adjacent C4. This creates the bright, distinctive ukulele sound and timbre.
Low-G replaces the standard G4 with G3 (196.00 Hz), giving the ukulele a wider melodic range and fuller bass response. It requires a special wound or unwound nylon G string.
Baritone ukulele uses DGBE tuning — the same as the top 4 strings of a guitar. Select the Baritone (DGBE) preset in the tuner above.
New strings, especially nylon strings, need time to stretch and settle. Tune frequently during the first week. Temperature and humidity changes also affect tuning. Always tune up to pitch (from below) rather than down.
Nylon strings are bright and affordable — great for beginners and soprano ukulele. Fluorocarbon strings offer more projection, clarity, and tuning stability, popular on concert and tenor ukulele. Wound strings provide fuller bass but can squeak under fingers, typically used for Low-G and baritone ukulele.
A chromatic tuner app works for any instrument including ukulele, as long as it detects the specific notes G4, C4, E4, and A4. A dedicated ukulele tuner like this one visually highlights the correct string and provides string-specific feedback.
Tune before every playing session. Ukuleles — especially those with nylon strings — go out of tune with temperature changes, humidity shifts, and normal playing. New strings require re-tuning multiple times per session during the first week.
Soprano is the traditional choice — small, lightweight, and produces the classic ukulele sound. Concert is also excellent for beginners, offering more fret space for larger hands. Both use the same GCEA tuning and the same chord shapes.
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